content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * ---------------
   * ColorBlock.java
   * ---------------
   * (C) Copyright 2004-2012, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes:
   * --------
   * 22-Oct-2004 : Version 1 (DG);
   * 20-Apr-2005 : Added new draw() method (DG);
   * ------------- JFREECHART 1.0.x ---------------------------------------------
   * 16-Mar-2007 : Implemented equals() and fixed serialization (DG);
   * 08-Apr-2008 : Added code for margin, border and padding in draw()
   *               method (DG);
   * 12-Jun-2012 : Removed JCommon dependencies (DG);
   *
   */
  
  package org.jfree.chart.block;
  
  import java.awt.Graphics2D;
  import java.awt.Paint;
  import java.awt.geom.Rectangle2D;
  import java.io.IOException;
  import java.io.ObjectInputStream;
  import java.io.ObjectOutputStream;
  
  import org.jfree.chart.ui.Size2D;
  import org.jfree.chart.util.PaintUtilities;
  import org.jfree.chart.util.SerialUtilities;
  
  /**
   * A block that is filled with a single color.
   */
  public class ColorBlock extends AbstractBlock implements Block {
  
      /** For serialization. */
      static final long serialVersionUID = 3383866145634010865L;
  
      /** The paint. */
      private transient Paint paint;
  
      /**
       * Creates a new block.
       *
       * @param paint  the paint (<code>null</code> not permitted).
       * @param width  the width.
       * @param height  the height.
       */
      public ColorBlock(Paint paint, double width, double height) {
          if (paint == null) {
              throw new IllegalArgumentException("Null 'paint' argument.");
          }
          this.paint = paint;
          setWidth(width);
          setHeight(height);
      }
  
      /**
       * Returns the paint.
       *
       * @return The paint (never <code>null</code>).
       *
       * @since 1.0.5
       */
      public Paint getPaint() {
          return this.paint;
      }
  
      /**
       * Arranges the contents of the block, within the given constraints, and
       * returns the block size.
       *
       * @param g2  the graphics device.
       * @param constraint  the constraint (<code>null</code> not permitted).
       *
       * @return The block size (in Java2D units, never <code>null</code>).
       */
      @Override
      public Size2D arrange(Graphics2D g2, RectangleConstraint constraint) {
          return new Size2D(calculateTotalWidth(getWidth()),
                  calculateTotalHeight(getHeight()));
      }
  
      /**
       * Draws the block.
       *
       * @param g2  the graphics device.
       * @param area  the area.
       */
      @Override
      public void draw(Graphics2D g2, Rectangle2D area) {
          area = trimMargin(area);
          drawBorder(g2, area);
          area = trimBorder(area);
          area = trimPadding(area);
          g2.setPaint(this.paint);
          g2.fill(area);
      }
  
      /**
       * Draws the block within the specified area.
       *
       * @param g2  the graphics device.
       * @param area  the area.
       * @param params  ignored (<code>null</code> permitted).
       *
       * @return Always <code>null</code>.
       */
      @Override
      public Object draw(Graphics2D g2, Rectangle2D area, Object params) {
          draw(g2, area);
          return null;
      }
  
      /**
       * Tests this block for equality with an arbitrary object.
       *
       * @param obj  the object (<code>null</code> permitted).
       *
       * @return A boolean.
       */
      @Override
      public boolean equals(Object obj) {
          if (obj == this) {
              return true;
          }
          if (!(obj instanceof ColorBlock)) {
              return false;
          }
          ColorBlock that = (ColorBlock) obj;
          if (!PaintUtilities.equal(this.paint, that.paint)) {
              return false;
          }
          return super.equals(obj);
      }
  
      /**
       * Provides serialization support.
       *
       * @param stream  the output stream.
       *
       * @throws IOException if there is an I/O error.
       */
      private void writeObject(ObjectOutputStream stream) throws IOException {
          stream.defaultWriteObject();
          SerialUtilities.writePaint(this.paint, stream);
      }
  
      /**
       * Provides serialization support.
       *
       * @param stream  the input stream.
       *
       * @throws IOException  if there is an I/O error.
       * @throws ClassNotFoundException  if there is a classpath problem.
       */
      private void readObject(ObjectInputStream stream)
          throws IOException, ClassNotFoundException {
          stream.defaultReadObject();
          this.paint = SerialUtilities.readPaint(stream);
      }
  
  }
  